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-rw-r--r--clang/lib/Sema/SemaTemplateDeduction.cpp180
1 files changed, 113 insertions, 67 deletions
diff --git a/clang/lib/Sema/SemaTemplateDeduction.cpp b/clang/lib/Sema/SemaTemplateDeduction.cpp
index 3b02624e536..5c98ebf39ab 100644
--- a/clang/lib/Sema/SemaTemplateDeduction.cpp
+++ b/clang/lib/Sema/SemaTemplateDeduction.cpp
@@ -114,7 +114,8 @@ DeduceTemplateArguments(Sema &S, TemplateParameterList *TemplateParams,
/// \brief If the given expression is of a form that permits the deduction
/// of a non-type template parameter, return the declaration of that
/// non-type template parameter.
-static NonTypeTemplateParmDecl *getDeducedParameterFromExpr(Expr *E) {
+static NonTypeTemplateParmDecl *
+getDeducedParameterFromExpr(TemplateDeductionInfo &Info, Expr *E) {
// If we are within an alias template, the expression may have undergone
// any number of parameter substitutions already.
while (1) {
@@ -128,7 +129,9 @@ static NonTypeTemplateParmDecl *getDeducedParameterFromExpr(Expr *E) {
}
if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E))
- return dyn_cast<NonTypeTemplateParmDecl>(DRE->getDecl());
+ if (auto *NTTP = dyn_cast<NonTypeTemplateParmDecl>(DRE->getDecl()))
+ if (NTTP->getDepth() == Info.getDeducedDepth())
+ return NTTP;
return nullptr;
}
@@ -310,8 +313,8 @@ static Sema::TemplateDeductionResult DeduceNonTypeTemplateArgument(
NonTypeTemplateParmDecl *NTTP, const llvm::APSInt &Value,
QualType ValueType, bool DeducedFromArrayBound, TemplateDeductionInfo &Info,
SmallVectorImpl<DeducedTemplateArgument> &Deduced) {
- assert(NTTP->getDepth() == 0 &&
- "Cannot deduce non-type template argument with depth > 0");
+ assert(NTTP->getDepth() == Info.getDeducedDepth() &&
+ "deducing non-type template argument with wrong depth");
DeducedTemplateArgument NewDeduced(S.Context, Value, ValueType,
DeducedFromArrayBound);
@@ -377,8 +380,8 @@ DeduceNonTypeTemplateArgument(Sema &S,
Expr *Value,
TemplateDeductionInfo &Info,
SmallVectorImpl<DeducedTemplateArgument> &Deduced) {
- assert(NTTP->getDepth() == 0 &&
- "Cannot deduce non-type template argument with depth > 0");
+ assert(NTTP->getDepth() == Info.getDeducedDepth() &&
+ "deducing non-type template argument with wrong depth");
assert((Value->isTypeDependent() || Value->isValueDependent()) &&
"Expression template argument must be type- or value-dependent.");
@@ -413,8 +416,8 @@ DeduceNonTypeTemplateArgument(Sema &S,
ValueDecl *D, QualType T,
TemplateDeductionInfo &Info,
SmallVectorImpl<DeducedTemplateArgument> &Deduced) {
- assert(NTTP->getDepth() == 0 &&
- "Cannot deduce non-type template argument with depth > 0");
+ assert(NTTP->getDepth() == Info.getDeducedDepth() &&
+ "deducing non-type template argument with wrong depth");
D = D ? cast<ValueDecl>(D->getCanonicalDecl()) : nullptr;
TemplateArgument New(D, T);
@@ -453,6 +456,10 @@ DeduceTemplateArguments(Sema &S,
if (TemplateTemplateParmDecl *TempParam
= dyn_cast<TemplateTemplateParmDecl>(ParamDecl)) {
+ // If we're not deducing at this depth, there's nothing to deduce.
+ if (TempParam->getDepth() != Info.getDeducedDepth())
+ return Sema::TDK_Success;
+
DeducedTemplateArgument NewDeduced(S.Context.getCanonicalTemplateName(Arg));
DeducedTemplateArgument Result = checkDeducedTemplateArguments(S.Context,
Deduced[TempParam->getIndex()],
@@ -655,7 +662,7 @@ public:
for (unsigned I = 0, N = Unexpanded.size(); I != N; ++I) {
unsigned Depth, Index;
std::tie(Depth, Index) = getDepthAndIndex(Unexpanded[I]);
- if (Depth == 0 && !SawIndices[Index]) {
+ if (Depth == Info.getDeducedDepth() && !SawIndices[Index]) {
SawIndices[Index] = true;
// Save the deduced template argument for the parameter pack expanded
@@ -686,7 +693,8 @@ public:
S.CurrentInstantiationScope->getPartiallySubstitutedPack(
&ExplicitArgs, &NumExplicitArgs);
if (PartiallySubstitutedPack &&
- getDepthAndIndex(PartiallySubstitutedPack).second == Pack.Index)
+ getDepthAndIndex(PartiallySubstitutedPack) ==
+ std::make_pair(Info.getDeducedDepth(), Pack.Index))
Pack.New.append(ExplicitArgs, ExplicitArgs + NumExplicitArgs);
}
}
@@ -1124,8 +1132,10 @@ DeduceTemplateArgumentsByTypeMatch(Sema &S,
// cv-list T
if (const TemplateTypeParmType *TemplateTypeParm
= Param->getAs<TemplateTypeParmType>()) {
- // Just skip any attempts to deduce from a placeholder type.
- if (Arg->isPlaceholderType())
+ // Just skip any attempts to deduce from a placeholder type or a parameter
+ // at a different depth.
+ if (Arg->isPlaceholderType() ||
+ Info.getDeducedDepth() != TemplateTypeParm->getDepth())
return Sema::TDK_Success;
unsigned Index = TemplateTypeParm->getIndex();
@@ -1152,7 +1162,8 @@ DeduceTemplateArgumentsByTypeMatch(Sema &S,
return Sema::TDK_Underqualified;
}
- assert(TemplateTypeParm->getDepth() == 0 && "Can't deduce with depth > 0");
+ assert(TemplateTypeParm->getDepth() == Info.getDeducedDepth() &&
+ "saw template type parameter with wrong depth");
assert(Arg != S.Context.OverloadTy && "Unresolved overloaded function");
QualType DeducedType = Arg;
@@ -1404,14 +1415,14 @@ DeduceTemplateArgumentsByTypeMatch(Sema &S,
// Determine the array bound is something we can deduce.
NonTypeTemplateParmDecl *NTTP
- = getDeducedParameterFromExpr(DependentArrayParm->getSizeExpr());
+ = getDeducedParameterFromExpr(Info, DependentArrayParm->getSizeExpr());
if (!NTTP)
return Sema::TDK_Success;
// We can perform template argument deduction for the given non-type
// template parameter.
- assert(NTTP->getDepth() == 0 &&
- "Cannot deduce non-type template argument at depth > 0");
+ assert(NTTP->getDepth() == Info.getDeducedDepth() &&
+ "saw non-type template parameter with wrong depth");
if (const ConstantArrayType *ConstantArrayArg
= dyn_cast<ConstantArrayType>(ArrayArg)) {
llvm::APSInt Size(ConstantArrayArg->getSize());
@@ -1689,14 +1700,17 @@ DeduceTemplateArgumentsByTypeMatch(Sema &S,
// Perform deduction on the vector size, if we can.
NonTypeTemplateParmDecl *NTTP
- = getDeducedParameterFromExpr(VectorParam->getSizeExpr());
+ = getDeducedParameterFromExpr(Info, VectorParam->getSizeExpr());
if (!NTTP)
return Sema::TDK_Success;
llvm::APSInt ArgSize(S.Context.getTypeSize(S.Context.IntTy), false);
ArgSize = VectorArg->getNumElements();
+ // Note that we use the "array bound" rules here; just like in that
+ // case, we don't have any particular type for the vector size, but
+ // we can provide one if necessary.
return DeduceNonTypeTemplateArgument(S, TemplateParams, NTTP, ArgSize,
- S.Context.IntTy, false, Info,
+ S.Context.IntTy, true, Info,
Deduced);
}
@@ -1712,7 +1726,7 @@ DeduceTemplateArgumentsByTypeMatch(Sema &S,
// Perform deduction on the vector size, if we can.
NonTypeTemplateParmDecl *NTTP
- = getDeducedParameterFromExpr(VectorParam->getSizeExpr());
+ = getDeducedParameterFromExpr(Info, VectorParam->getSizeExpr());
if (!NTTP)
return Sema::TDK_Success;
@@ -1820,7 +1834,7 @@ DeduceTemplateArguments(Sema &S,
case TemplateArgument::Expression: {
if (NonTypeTemplateParmDecl *NTTP
- = getDeducedParameterFromExpr(Param.getAsExpr())) {
+ = getDeducedParameterFromExpr(Info, Param.getAsExpr())) {
if (Arg.getKind() == TemplateArgument::Integral)
return DeduceNonTypeTemplateArgument(S, TemplateParams, NTTP,
Arg.getAsIntegral(),
@@ -2132,7 +2146,7 @@ ConvertDeducedTemplateArgument(Sema &S, NamedDecl *Param,
DeducedTemplateArgument Arg,
NamedDecl *Template,
TemplateDeductionInfo &Info,
- bool InFunctionTemplate,
+ bool IsDeduced,
SmallVectorImpl<TemplateArgument> &Output) {
auto ConvertArg = [&](DeducedTemplateArgument Arg,
unsigned ArgumentPackIndex) {
@@ -2146,7 +2160,7 @@ ConvertDeducedTemplateArgument(Sema &S, NamedDecl *Param,
return S.CheckTemplateArgument(
Param, ArgLoc, Template, Template->getLocation(),
Template->getSourceRange().getEnd(), ArgumentPackIndex, Output,
- InFunctionTemplate
+ IsDeduced
? (Arg.wasDeducedFromArrayBound() ? Sema::CTAK_DeducedFromArrayBound
: Sema::CTAK_Deduced)
: Sema::CTAK_Specified);
@@ -2210,7 +2224,7 @@ ConvertDeducedTemplateArgument(Sema &S, NamedDecl *Param,
// TemplateDecl.
template<typename TemplateDeclT>
static Sema::TemplateDeductionResult ConvertDeducedTemplateArguments(
- Sema &S, TemplateDeclT *Template,
+ Sema &S, TemplateDeclT *Template, bool IsDeduced,
SmallVectorImpl<DeducedTemplateArgument> &Deduced,
TemplateDeductionInfo &Info, SmallVectorImpl<TemplateArgument> &Builder,
LocalInstantiationScope *CurrentInstantiationScope = nullptr,
@@ -2243,8 +2257,7 @@ static Sema::TemplateDeductionResult ConvertDeducedTemplateArguments(
// We have deduced this argument, so it still needs to be
// checked and converted.
if (ConvertDeducedTemplateArgument(S, Param, Deduced[I], Template, Info,
- isa<FunctionTemplateDecl>(Template),
- Builder)) {
+ IsDeduced, Builder)) {
Info.Param = makeTemplateParameter(Param);
// FIXME: These template arguments are temporary. Free them!
Info.reset(TemplateArgumentList::CreateCopy(S.Context, Builder));
@@ -2277,9 +2290,8 @@ static Sema::TemplateDeductionResult ConvertDeducedTemplateArguments(
// Go through the motions of checking the empty argument pack against
// the parameter pack.
DeducedTemplateArgument DeducedPack(TemplateArgument::getEmptyPack());
- if (ConvertDeducedTemplateArgument(
- S, Param, DeducedPack, Template, Info,
- isa<FunctionTemplateDecl>(Template), Builder)) {
+ if (ConvertDeducedTemplateArgument(S, Param, DeducedPack, Template,
+ Info, IsDeduced, Builder)) {
Info.Param = makeTemplateParameter(Param);
// FIXME: These template arguments are temporary. Free them!
Info.reset(TemplateArgumentList::CreateCopy(S.Context, Builder));
@@ -2352,7 +2364,8 @@ template <typename T>
static typename std::enable_if<IsPartialSpecialization<T>::value,
Sema::TemplateDeductionResult>::type
FinishTemplateArgumentDeduction(
- Sema &S, T *Partial, const TemplateArgumentList &TemplateArgs,
+ Sema &S, T *Partial, bool IsPartialOrdering,
+ const TemplateArgumentList &TemplateArgs,
SmallVectorImpl<DeducedTemplateArgument> &Deduced,
TemplateDeductionInfo &Info) {
// Unevaluated SFINAE context.
@@ -2365,8 +2378,8 @@ FinishTemplateArgumentDeduction(
// [...] or if any template argument remains neither deduced nor
// explicitly specified, template argument deduction fails.
SmallVector<TemplateArgument, 4> Builder;
- if (auto Result = ConvertDeducedTemplateArguments(S, Partial, Deduced,
- Info, Builder))
+ if (auto Result = ConvertDeducedTemplateArguments(
+ S, Partial, IsPartialOrdering, Deduced, Info, Builder))
return Result;
// Form the template argument list from the deduced template arguments.
@@ -2463,8 +2476,8 @@ Sema::DeduceTemplateArguments(ClassTemplatePartialSpecializationDecl *Partial,
if (Trap.hasErrorOccurred())
return Sema::TDK_SubstitutionFailure;
- return ::FinishTemplateArgumentDeduction(*this, Partial, TemplateArgs,
- Deduced, Info);
+ return ::FinishTemplateArgumentDeduction(
+ *this, Partial, /*PartialOrdering=*/false, TemplateArgs, Deduced, Info);
}
/// \brief Perform template argument deduction to determine whether
@@ -2503,8 +2516,8 @@ Sema::DeduceTemplateArguments(VarTemplatePartialSpecializationDecl *Partial,
if (Trap.hasErrorOccurred())
return Sema::TDK_SubstitutionFailure;
- return ::FinishTemplateArgumentDeduction(*this, Partial, TemplateArgs,
- Deduced, Info);
+ return ::FinishTemplateArgumentDeduction(
+ *this, Partial, /*PartialOrdering=*/false, TemplateArgs, Deduced, Info);
}
/// \brief Determine whether the given type T is a simple-template-id type.
@@ -2856,7 +2869,7 @@ Sema::FinishTemplateArgumentDeduction(FunctionTemplateDecl *FunctionTemplate,
// explicitly specified, template argument deduction fails.
SmallVector<TemplateArgument, 4> Builder;
if (auto Result = ConvertDeducedTemplateArguments(
- *this, FunctionTemplate, Deduced, Info, Builder,
+ *this, FunctionTemplate, /*IsDeduced*/true, Deduced, Info, Builder,
CurrentInstantiationScope, NumExplicitlySpecified,
PartialOverloading))
return Result;
@@ -3220,7 +3233,7 @@ DeduceFromInitializerList(Sema &S, TemplateParameterList *TemplateParams,
S.Context.getAsDependentSizedArrayType(AdjustedParamType);
// Determine the array bound is something we can deduce.
if (NonTypeTemplateParmDecl *NTTP =
- getDeducedParameterFromExpr(ArrTy->getSizeExpr())) {
+ getDeducedParameterFromExpr(Info, ArrTy->getSizeExpr())) {
// We can perform template argument deduction for the given non-type
// template parameter.
assert(NTTP->getDepth() == 0 &&
@@ -3950,10 +3963,12 @@ namespace {
class SubstituteAutoTransform :
public TreeTransform<SubstituteAutoTransform> {
QualType Replacement;
+ bool UseAutoSugar;
public:
- SubstituteAutoTransform(Sema &SemaRef, QualType Replacement)
+ SubstituteAutoTransform(Sema &SemaRef, QualType Replacement,
+ bool UseAutoSugar = true)
: TreeTransform<SubstituteAutoTransform>(SemaRef),
- Replacement(Replacement) {}
+ Replacement(Replacement), UseAutoSugar(UseAutoSugar) {}
QualType TransformAutoType(TypeLocBuilder &TLB, AutoTypeLoc TL) {
// If we're building the type pattern to deduce against, don't wrap the
@@ -3963,19 +3978,17 @@ namespace {
// auto &&lref = lvalue;
// must transform into "rvalue reference to T" not "rvalue reference to
// auto type deduced as T" in order for [temp.deduct.call]p3 to apply.
- if (!Replacement.isNull() && isa<TemplateTypeParmType>(Replacement)) {
+ if (!UseAutoSugar) {
+ assert(isa<TemplateTypeParmType>(Replacement) &&
+ "unexpected unsugared replacement kind");
QualType Result = Replacement;
TemplateTypeParmTypeLoc NewTL =
TLB.push<TemplateTypeParmTypeLoc>(Result);
NewTL.setNameLoc(TL.getNameLoc());
return Result;
} else {
- bool Dependent =
- !Replacement.isNull() && Replacement->isDependentType();
- QualType Result =
- SemaRef.Context.getAutoType(Dependent ? QualType() : Replacement,
- TL.getTypePtr()->getKeyword(),
- Dependent);
+ QualType Result = SemaRef.Context.getAutoType(
+ Replacement, TL.getTypePtr()->getKeyword(), Replacement.isNull());
AutoTypeLoc NewTL = TLB.push<AutoTypeLoc>(Result);
NewTL.setNameLoc(TL.getNameLoc());
return Result;
@@ -3998,18 +4011,29 @@ namespace {
}
Sema::DeduceAutoResult
-Sema::DeduceAutoType(TypeSourceInfo *Type, Expr *&Init, QualType &Result) {
- return DeduceAutoType(Type->getTypeLoc(), Init, Result);
+Sema::DeduceAutoType(TypeSourceInfo *Type, Expr *&Init, QualType &Result,
+ Optional<unsigned> DependentDeductionDepth) {
+ return DeduceAutoType(Type->getTypeLoc(), Init, Result,
+ DependentDeductionDepth);
}
/// \brief Deduce the type for an auto type-specifier (C++11 [dcl.spec.auto]p6)
///
+/// Note that this is done even if the initializer is dependent. (This is
+/// necessary to support partial ordering of templates using 'auto'.)
+/// A dependent type will be produced when deducing from a dependent type.
+///
/// \param Type the type pattern using the auto type-specifier.
/// \param Init the initializer for the variable whose type is to be deduced.
/// \param Result if type deduction was successful, this will be set to the
/// deduced type.
+/// \param DependentDeductionDepth Set if we should permit deduction in
+/// dependent cases. This is necessary for template partial ordering with
+/// 'auto' template parameters. The value specified is the template
+/// parameter depth at which we should perform 'auto' deduction.
Sema::DeduceAutoResult
-Sema::DeduceAutoType(TypeLoc Type, Expr *&Init, QualType &Result) {
+Sema::DeduceAutoType(TypeLoc Type, Expr *&Init, QualType &Result,
+ Optional<unsigned> DependentDeductionDepth) {
if (Init->getType()->isNonOverloadPlaceholderType()) {
ExprResult NonPlaceholder = CheckPlaceholderExpr(Init);
if (NonPlaceholder.isInvalid())
@@ -4017,12 +4041,16 @@ Sema::DeduceAutoType(TypeLoc Type, Expr *&Init, QualType &Result) {
Init = NonPlaceholder.get();
}
- if (Init->isTypeDependent() || Type.getType()->isDependentType()) {
- Result = SubstituteAutoTransform(*this, Context.DependentTy).Apply(Type);
+ if (!DependentDeductionDepth &&
+ (Type.getType()->isDependentType() || Init->isTypeDependent())) {
+ Result = SubstituteAutoTransform(*this, QualType()).Apply(Type);
assert(!Result.isNull() && "substituting DependentTy can't fail");
return DAR_Succeeded;
}
+ // Find the depth of template parameter to synthesize.
+ unsigned Depth = DependentDeductionDepth.getValueOr(0);
+
// If this is a 'decltype(auto)' specifier, do the decltype dance.
// Since 'decltype(auto)' can only occur at the top of the type, we
// don't need to go digging for it.
@@ -4055,15 +4083,16 @@ Sema::DeduceAutoType(TypeLoc Type, Expr *&Init, QualType &Result) {
LocalInstantiationScope InstScope(*this);
// Build template<class TemplParam> void Func(FuncParam);
- TemplateTypeParmDecl *TemplParam =
- TemplateTypeParmDecl::Create(Context, nullptr, SourceLocation(), Loc, 0, 0,
- nullptr, false, false);
+ TemplateTypeParmDecl *TemplParam = TemplateTypeParmDecl::Create(
+ Context, nullptr, SourceLocation(), Loc, Depth, 0, nullptr, false, false);
QualType TemplArg = QualType(TemplParam->getTypeForDecl(), 0);
NamedDecl *TemplParamPtr = TemplParam;
FixedSizeTemplateParameterListStorage<1, false> TemplateParamsSt(
Loc, Loc, TemplParamPtr, Loc, nullptr);
- QualType FuncParam = SubstituteAutoTransform(*this, TemplArg).Apply(Type);
+ QualType FuncParam =
+ SubstituteAutoTransform(*this, TemplArg, /*UseAutoSugar*/false)
+ .Apply(Type);
assert(!FuncParam.isNull() &&
"substituting template parameter for 'auto' failed");
@@ -4073,7 +4102,18 @@ Sema::DeduceAutoType(TypeLoc Type, Expr *&Init, QualType &Result) {
QualType InitType = Init->getType();
unsigned TDF = 0;
- TemplateDeductionInfo Info(Loc);
+ TemplateDeductionInfo Info(Loc, Depth);
+
+ // If deduction failed, don't diagnose if the initializer is dependent; it
+ // might acquire a matching type in the instantiation.
+ auto DeductionFailed = [&]() -> DeduceAutoResult {
+ if (Init->isTypeDependent()) {
+ Result = SubstituteAutoTransform(*this, QualType()).Apply(Type);
+ assert(!Result.isNull() && "substituting DependentTy can't fail");
+ return DAR_Succeeded;
+ }
+ return DAR_Failed;
+ };
InitListExpr *InitList = dyn_cast<InitListExpr>(Init);
if (InitList) {
@@ -4081,7 +4121,7 @@ Sema::DeduceAutoType(TypeLoc Type, Expr *&Init, QualType &Result) {
if (DeduceTemplateArgumentByListElement(*this, TemplateParamsSt.get(),
TemplArg, InitList->getInit(i),
Info, Deduced, TDF))
- return DAR_Failed;
+ return DeductionFailed();
}
} else {
if (!getLangOpts().CPlusPlus && Init->refersToBitField()) {
@@ -4096,11 +4136,12 @@ Sema::DeduceAutoType(TypeLoc Type, Expr *&Init, QualType &Result) {
if (DeduceTemplateArgumentsByTypeMatch(*this, TemplateParamsSt.get(),
FuncParam, InitType, Info, Deduced,
TDF))
- return DAR_Failed;
+ return DeductionFailed();
}
+ // Could be null if somehow 'auto' appears in a non-deduced context.
if (Deduced[0].getKind() != TemplateArgument::Type)
- return DAR_Failed;
+ return DeductionFailed();
QualType DeducedType = Deduced[0].getAsType();
@@ -4112,7 +4153,7 @@ Sema::DeduceAutoType(TypeLoc Type, Expr *&Init, QualType &Result) {
Result = SubstituteAutoTransform(*this, DeducedType).Apply(Type);
if (Result.isNull())
- return DAR_FailedAlreadyDiagnosed;
+ return DAR_FailedAlreadyDiagnosed;
// Check that the deduced argument type is compatible with the original
// argument type per C++ [temp.deduct.call]p4.
@@ -4121,7 +4162,7 @@ Sema::DeduceAutoType(TypeLoc Type, Expr *&Init, QualType &Result) {
Sema::OriginalCallArg(FuncParam,0,InitType),
Result)) {
Result = QualType();
- return DAR_Failed;
+ return DeductionFailed();
}
return DAR_Succeeded;
@@ -4129,14 +4170,18 @@ Sema::DeduceAutoType(TypeLoc Type, Expr *&Init, QualType &Result) {
QualType Sema::SubstAutoType(QualType TypeWithAuto,
QualType TypeToReplaceAuto) {
- return SubstituteAutoTransform(*this, TypeToReplaceAuto).
- TransformType(TypeWithAuto);
+ if (TypeToReplaceAuto->isDependentType())
+ TypeToReplaceAuto = QualType();
+ return SubstituteAutoTransform(*this, TypeToReplaceAuto)
+ .TransformType(TypeWithAuto);
}
TypeSourceInfo* Sema::SubstAutoTypeSourceInfo(TypeSourceInfo *TypeWithAuto,
QualType TypeToReplaceAuto) {
- return SubstituteAutoTransform(*this, TypeToReplaceAuto).
- TransformType(TypeWithAuto);
+ if (TypeToReplaceAuto->isDependentType())
+ TypeToReplaceAuto = QualType();
+ return SubstituteAutoTransform(*this, TypeToReplaceAuto)
+ .TransformType(TypeWithAuto);
}
void Sema::DiagnoseAutoDeductionFailure(VarDecl *VDecl, Expr *Init) {
@@ -4575,8 +4620,9 @@ static bool isAtLeastAsSpecializedAs(Sema &S, QualType T1, QualType T2,
Sema::InstantiatingTemplate Inst(S, Loc, P2, DeducedArgs, Info);
auto *TST1 = T1->castAs<TemplateSpecializationType>();
if (FinishTemplateArgumentDeduction(
- S, P2, TemplateArgumentList(TemplateArgumentList::OnStack,
- TST1->template_arguments()),
+ S, P2, /*PartialOrdering=*/true,
+ TemplateArgumentList(TemplateArgumentList::OnStack,
+ TST1->template_arguments()),
Deduced, Info))
return false;
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